Experimental research design aims to test hypotheses about causal relationships. It involves manipulating an independent variable and observing its effect on a dependent variable under controlled conditions. True experimental designs have three key characteristics - manipulation, control, and randomization. Manipulation means consciously controlling the independent variable. Control involves using a control group to account for extraneous variables. Randomization ensures subjects are randomly assigned to conditions. Common true experimental designs include post-test only, pretest-posttest, Solomon four-group, factorial, randomized block, and crossover designs. While powerful for establishing causation, experimental designs also have limitations for studying humans.
Normal provability curve is one of the important topic in the Educational research.The theory of parametric tests in the inferential statistics is completely based on the NPC. Every researcher must know the characteristics of the NPC.
Review of literature is one of the most important steps in the research process. It is an account of what is already known about a particular phenomenon.
Literature review is a laborious task, but it is essential if the research process is to be successful.
A literature review is a search and evaluation of the available literature in your given subject or chosen topic area. It documents the state of the art with respect to the subject or topic you are writing about. It surveys the literature in your chosen area of study.
Normal provability curve is one of the important topic in the Educational research.The theory of parametric tests in the inferential statistics is completely based on the NPC. Every researcher must know the characteristics of the NPC.
Review of literature is one of the most important steps in the research process. It is an account of what is already known about a particular phenomenon.
Literature review is a laborious task, but it is essential if the research process is to be successful.
A literature review is a search and evaluation of the available literature in your given subject or chosen topic area. It documents the state of the art with respect to the subject or topic you are writing about. It surveys the literature in your chosen area of study.
Recomendações da OMS sobre cuidados maternos e neonatais para uma experiência pós-natal positiva.
Em consonância com os ODS – Objetivos do Desenvolvimento Sustentável e a Estratégia Global para a Saúde das Mulheres, Crianças e Adolescentes, e aplicando uma abordagem baseada nos direitos humanos, os esforços de cuidados pós-natais devem expandir-se para além da cobertura e da simples sobrevivência, de modo a incluir cuidados de qualidade.
Estas diretrizes visam melhorar a qualidade dos cuidados pós-natais essenciais e de rotina prestados às mulheres e aos recém-nascidos, com o objetivo final de melhorar a saúde e o bem-estar materno e neonatal.
Uma “experiência pós-natal positiva” é um resultado importante para todas as mulheres que dão à luz e para os seus recém-nascidos, estabelecendo as bases para a melhoria da saúde e do bem-estar a curto e longo prazo. Uma experiência pós-natal positiva é definida como aquela em que as mulheres, pessoas que gestam, os recém-nascidos, os casais, os pais, os cuidadores e as famílias recebem informação consistente, garantia e apoio de profissionais de saúde motivados; e onde um sistema de saúde flexível e com recursos reconheça as necessidades das mulheres e dos bebês e respeite o seu contexto cultural.
Estas diretrizes consolidadas apresentam algumas recomendações novas e já bem fundamentadas sobre cuidados pós-natais de rotina para mulheres e neonatos que recebem cuidados no pós-parto em unidades de saúde ou na comunidade, independentemente dos recursos disponíveis.
É fornecido um conjunto abrangente de recomendações para cuidados durante o período puerperal, com ênfase nos cuidados essenciais que todas as mulheres e recém-nascidos devem receber, e com a devida atenção à qualidade dos cuidados; isto é, a entrega e a experiência do cuidado recebido. Estas diretrizes atualizam e ampliam as recomendações da OMS de 2014 sobre cuidados pós-natais da mãe e do recém-nascido e complementam as atuais diretrizes da OMS sobre a gestão de complicações pós-natais.
O estabelecimento da amamentação e o manejo das principais intercorrências é contemplada.
Recomendamos muito.
Vamos discutir essas recomendações no nosso curso de pós-graduação em Aleitamento no Instituto Ciclos.
Esta publicação só está disponível em inglês até o momento.
Prof. Marcus Renato de Carvalho
www.agostodourado.com
These simplified slides by Dr. Sidra Arshad present an overview of the non-respiratory functions of the respiratory tract.
Learning objectives:
1. Enlist the non-respiratory functions of the respiratory tract
2. Briefly explain how these functions are carried out
3. Discuss the significance of dead space
4. Differentiate between minute ventilation and alveolar ventilation
5. Describe the cough and sneeze reflexes
Study Resources:
1. Chapter 39, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 34, Ganong’s Review of Medical Physiology, 26th edition
3. Chapter 17, Human Physiology by Lauralee Sherwood, 9th edition
4. Non-respiratory functions of the lungs https://academic.oup.com/bjaed/article/13/3/98/278874
Knee anatomy and clinical tests 2024.pdfvimalpl1234
This includes all relevant anatomy and clinical tests compiled from standard textbooks, Campbell,netter etc..It is comprehensive and best suited for orthopaedicians and orthopaedic residents.
The prostate is an exocrine gland of the male mammalian reproductive system
It is a walnut-sized gland that forms part of the male reproductive system and is located in front of the rectum and just below the urinary bladder
Function is to store and secrete a clear, slightly alkaline fluid that constitutes 10-30% of the volume of the seminal fluid that along with the spermatozoa, constitutes semen
A healthy human prostate measures (4cm-vertical, by 3cm-horizontal, 2cm ant-post ).
It surrounds the urethra just below the urinary bladder. It has anterior, median, posterior and two lateral lobes
It’s work is regulated by androgens which are responsible for male sex characteristics
Generalised disease of the prostate due to hormonal derangement which leads to non malignant enlargement of the gland (increase in the number of epithelial cells and stromal tissue)to cause compression of the urethra leading to symptoms (LUTS
Title: Sense of Taste
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the structure and function of taste buds.
Describe the relationship between the taste threshold and taste index of common substances.
Explain the chemical basis and signal transduction of taste perception for each type of primary taste sensation.
Recognize different abnormalities of taste perception and their causes.
Key Topics:
Significance of Taste Sensation:
Differentiation between pleasant and harmful food
Influence on behavior
Selection of food based on metabolic needs
Receptors of Taste:
Taste buds on the tongue
Influence of sense of smell, texture of food, and pain stimulation (e.g., by pepper)
Primary and Secondary Taste Sensations:
Primary taste sensations: Sweet, Sour, Salty, Bitter, Umami
Chemical basis and signal transduction mechanisms for each taste
Taste Threshold and Index:
Taste threshold values for Sweet (sucrose), Salty (NaCl), Sour (HCl), and Bitter (Quinine)
Taste index relationship: Inversely proportional to taste threshold
Taste Blindness:
Inability to taste certain substances, particularly thiourea compounds
Example: Phenylthiocarbamide
Structure and Function of Taste Buds:
Composition: Epithelial cells, Sustentacular/Supporting cells, Taste cells, Basal cells
Features: Taste pores, Taste hairs/microvilli, and Taste nerve fibers
Location of Taste Buds:
Found in papillae of the tongue (Fungiform, Circumvallate, Foliate)
Also present on the palate, tonsillar pillars, epiglottis, and proximal esophagus
Mechanism of Taste Stimulation:
Interaction of taste substances with receptors on microvilli
Signal transduction pathways for Umami, Sweet, Bitter, Sour, and Salty tastes
Taste Sensitivity and Adaptation:
Decrease in sensitivity with age
Rapid adaptation of taste sensation
Role of Saliva in Taste:
Dissolution of tastants to reach receptors
Washing away the stimulus
Taste Preferences and Aversions:
Mechanisms behind taste preference and aversion
Influence of receptors and neural pathways
Impact of Sensory Nerve Damage:
Degeneration of taste buds if the sensory nerve fiber is cut
Abnormalities of Taste Detection:
Conditions: Ageusia, Hypogeusia, Dysgeusia (parageusia)
Causes: Nerve damage, neurological disorders, infections, poor oral hygiene, adverse drug effects, deficiencies, aging, tobacco use, altered neurotransmitter levels
Neurotransmitters and Taste Threshold:
Effects of serotonin (5-HT) and norepinephrine (NE) on taste sensitivity
Supertasters:
25% of the population with heightened sensitivity to taste, especially bitterness
Increased number of fungiform papillae
Explore natural remedies for syphilis treatment in Singapore. Discover alternative therapies, herbal remedies, and lifestyle changes that may complement conventional treatments. Learn about holistic approaches to managing syphilis symptoms and supporting overall health.
ARTIFICIAL INTELLIGENCE IN HEALTHCARE.pdfAnujkumaranit
Artificial intelligence (AI) refers to the simulation of human intelligence processes by machines, especially computer systems. It encompasses tasks such as learning, reasoning, problem-solving, perception, and language understanding. AI technologies are revolutionizing various fields, from healthcare to finance, by enabling machines to perform tasks that typically require human intelligence.
New Drug Discovery and Development .....NEHA GUPTA
The "New Drug Discovery and Development" process involves the identification, design, testing, and manufacturing of novel pharmaceutical compounds with the aim of introducing new and improved treatments for various medical conditions. This comprehensive endeavor encompasses various stages, including target identification, preclinical studies, clinical trials, regulatory approval, and post-market surveillance. It involves multidisciplinary collaboration among scientists, researchers, clinicians, regulatory experts, and pharmaceutical companies to bring innovative therapies to market and address unmet medical needs.
- Video recording of this lecture in English language: https://youtu.be/lK81BzxMqdo
- Video recording of this lecture in Arabic language: https://youtu.be/Ve4P0COk9OI
- Link to download the book free: https://nephrotube.blogspot.com/p/nephrotube-nephrology-books.html
- Link to NephroTube website: www.NephroTube.com
- Link to NephroTube social media accounts: https://nephrotube.blogspot.com/p/join-nephrotube-on-social-media.html
Pulmonary Thromboembolism - etilogy, types, medical- Surgical and nursing man...VarunMahajani
Disruption of blood supply to lung alveoli due to blockage of one or more pulmonary blood vessels is called as Pulmonary thromboembolism. In this presentation we will discuss its causes, types and its management in depth.
Title: Sense of Smell
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the primary categories of smells and the concept of odor blindness.
Explain the structure and location of the olfactory membrane and mucosa, including the types and roles of cells involved in olfaction.
Describe the pathway and mechanisms of olfactory signal transmission from the olfactory receptors to the brain.
Illustrate the biochemical cascade triggered by odorant binding to olfactory receptors, including the role of G-proteins and second messengers in generating an action potential.
Identify different types of olfactory disorders such as anosmia, hyposmia, hyperosmia, and dysosmia, including their potential causes.
Key Topics:
Olfactory Genes:
3% of the human genome accounts for olfactory genes.
400 genes for odorant receptors.
Olfactory Membrane:
Located in the superior part of the nasal cavity.
Medially: Folds downward along the superior septum.
Laterally: Folds over the superior turbinate and upper surface of the middle turbinate.
Total surface area: 5-10 square centimeters.
Olfactory Mucosa:
Olfactory Cells: Bipolar nerve cells derived from the CNS (100 million), with 4-25 olfactory cilia per cell.
Sustentacular Cells: Produce mucus and maintain ionic and molecular environment.
Basal Cells: Replace worn-out olfactory cells with an average lifespan of 1-2 months.
Bowman’s Gland: Secretes mucus.
Stimulation of Olfactory Cells:
Odorant dissolves in mucus and attaches to receptors on olfactory cilia.
Involves a cascade effect through G-proteins and second messengers, leading to depolarization and action potential generation in the olfactory nerve.
Quality of a Good Odorant:
Small (3-20 Carbon atoms), volatile, water-soluble, and lipid-soluble.
Facilitated by odorant-binding proteins in mucus.
Membrane Potential and Action Potential:
Resting membrane potential: -55mV.
Action potential frequency in the olfactory nerve increases with odorant strength.
Adaptation Towards the Sense of Smell:
Rapid adaptation within the first second, with further slow adaptation.
Psychological adaptation greater than receptor adaptation, involving feedback inhibition from the central nervous system.
Primary Sensations of Smell:
Camphoraceous, Musky, Floral, Pepperminty, Ethereal, Pungent, Putrid.
Odor Detection Threshold:
Examples: Hydrogen sulfide (0.0005 ppm), Methyl-mercaptan (0.002 ppm).
Some toxic substances are odorless at lethal concentrations.
Characteristics of Smell:
Odor blindness for single substances due to lack of appropriate receptor protein.
Behavioral and emotional influences of smell.
Transmission of Olfactory Signals:
From olfactory cells to glomeruli in the olfactory bulb, involving lateral inhibition.
Primitive, less old, and new olfactory systems with different path
These lecture slides, by Dr Sidra Arshad, offer a quick overview of physiological basis of a normal electrocardiogram.
Learning objectives:
1. Define an electrocardiogram (ECG) and electrocardiography
2. Describe how dipoles generated by the heart produce the waveforms of the ECG
3. Describe the components of a normal electrocardiogram of a typical bipolar leads (limb II)
4. Differentiate between intervals and segments
5. Enlist some common indications for obtaining an ECG
Study Resources:
1. Chapter 11, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 9, Human Physiology - From Cells to Systems, Lauralee Sherwood, 9th edition
3. Chapter 29, Ganong’s Review of Medical Physiology, 26th edition
4. Electrocardiogram, StatPearls - https://www.ncbi.nlm.nih.gov/books/NBK549803/
5. ECG in Medical Practice by ABM Abdullah, 4th edition
6. ECG Basics, http://www.nataliescasebook.com/tag/e-c-g-basics
Ethanol (CH3CH2OH), or beverage alcohol, is a two-carbon alcohol
that is rapidly distributed in the body and brain. Ethanol alters many
neurochemical systems and has rewarding and addictive properties. It
is the oldest recreational drug and likely contributes to more morbidity,
mortality, and public health costs than all illicit drugs combined. The
5th edition of the Diagnostic and Statistical Manual of Mental Disorders
(DSM-5) integrates alcohol abuse and alcohol dependence into a single
disorder called alcohol use disorder (AUD), with mild, moderate,
and severe subclassifications (American Psychiatric Association, 2013).
In the DSM-5, all types of substance abuse and dependence have been
combined into a single substance use disorder (SUD) on a continuum
from mild to severe. A diagnosis of AUD requires that at least two of
the 11 DSM-5 behaviors be present within a 12-month period (mild
AUD: 2–3 criteria; moderate AUD: 4–5 criteria; severe AUD: 6–11 criteria).
The four main behavioral effects of AUD are impaired control over
drinking, negative social consequences, risky use, and altered physiological
effects (tolerance, withdrawal). This chapter presents an overview
of the prevalence and harmful consequences of AUD in the U.S.,
the systemic nature of the disease, neurocircuitry and stages of AUD,
comorbidities, fetal alcohol spectrum disorders, genetic risk factors, and
pharmacotherapies for AUD.
NVBDCP.pptx Nation vector borne disease control programSapna Thakur
NVBDCP was launched in 2003-2004 . Vector-Borne Disease: Disease that results from an infection transmitted to humans and other animals by blood-feeding arthropods, such as mosquitoes, ticks, and fleas. Examples of vector-borne diseases include Dengue fever, West Nile Virus, Lyme disease, and malaria.
2. CHARACTERISTICS
• Experimental research is defined as
“OBSERVATIONS UNDER
CONTROLLED CONDITIONS”.
• In experimental design the
researcher is active agent rather
than a passive observer.
3. • Experimental designs are concerned with
examination of the effect of an
independent variable on dependent
variable, where the independent variable is
manipulated through treatment or
intervention(s).
• True experimental designs consists of three
cardinal feature: RANDOMIZATION,
CONTROL & MANIPULATION or TRIAL.
4. • According to Riely, experimental design
is a powerful design for testing
hypotheses of causal relationship
among variables.
• Experimental research design is further
classified as TRUE EXPERIMENTAL
DESIGN, QUASI EXPERIMENTAL DESIGN
& PRE EXPERIMENTAL DESIGN
5. TRUE EXPERIMENTAL DESIGNS
• In true experimental designs the
researchers have complete control over
the extraneous variables and can predict
confidently that the observed effect on
the dependent variable is only due to
the manipulation of independent
variable.
6. ESSENTIAL CHARACTERISTICS
A true experimental design consists
of three important characteristics.
They are as follows:
1. MANIPULATION.
2. CONTROL.
3. RANDOMIZATION.
7. MANIPULATION
• Manipulation refers to conscious control
of the independent variable by the
researcher through treatment or
intervention to observe it’s effect on the
dependent variable.
INDEPENDENT VARIABLE MEDICATION
DEPENDENT VARIABLE PAIN LEVEL
8. CONTROL
• Control refers to the use of control group
and controlling the effects of extraneous
variables on the dependent variable in
which the researcher is interested.
• The subjects in the control and
experimental groups are similar in number
& characteristics, but the subjects in the
control group do not receive experimental
treatment or any intervention.
9. • A comparison of the experimental
group is made with the control group
to observe the effect of the treatment
or intervention.
• The control of effects of extraneous
variables on the dependent variable
can be ensured by adopting one of the
following measures : Matching,
counterbalancing, Homogeneity by
statistical test.
10. MATCHING
• Is a conscious “matching" of the subject
characteristics in both the groups.
• It is a weak but a common method of
control over the extraneous variables.
• In matching the researcher identifies one or
more extraneous variables to be controlled
which are supposed to have effect on
dependent variable.
11. • As the subjects are recruited for one of the
treatment groups, the researcher tries to find
subjects for the other group (similar to the
subjects of the first group based on the
specific matching variable).
• For example if age and gender are the
matching variables of interest in a two group
study (if 40 yrs old man is recruited for the
first group, the researcher would try to find
another man aged 40 yrs for the second
group)
12. COUNTER BALANCING
• Counter balancing is another way to
exert control over extraneous variables.
• Counter balancing is used in which the
researcher is concerned that the orders
in which the treatment or interventions
are administered influence the study
results.
13. HOMOGENEITY BY STATISTICAL
TEST
• To ensure homogeneity of the
demographic characteristics among
two groups under study, a chi-
square test may be applied on the
frequency distribution of selected
characteristics in two groups.
14. RANDOMIZATION
• Means that every subject has an equal
chance of being assigned to experimental
or control group.
• This is called random assignment of
subjects.
• The process involves random assignment
to different groups
15. • Through random assignment chances
of systemic bias is eliminated.
• Randomization is used in true
experimental designs to minimize the
threats of internal validity of the study
and eliminates the effects of
extraneous variables on the dependent
variables.
16. METHODS OF
RANDOMIZATION
• Random assignment of study subjects
may be done with simple flip of a coin
for each subject. If coin lands on its
“head”, subjects are assigned to first
group & with “tail” the subjects are
assigned to the second group.
17. • Another methods is to write the names
of the subjects on slips of paper and put
the slips into a bowl and then drew lots.
The first designated numbers of subjects
are placed in one group and the rest are
assigned under another group.
18. • A random table may be used to facilitate
the randomization process. In this
method blindfolds the subjects to chose
a number from a table of numbers
horizontally (row) or vertically (column),
till a requisite number is reached for
both the experimental & control group.
• Computer assisted random sequences
also may be used for the random
assignment of the subjects.
21. TYPES OF TRUE EXPERIMENTAL
DESIGNS
1. POST TEST ONLY DESIGN.
2. PRETEST-POST-TEST-ONLY DESIGN.
3. SOLOMOM FOUR GROUP DESIGN.
4. FACTORIAL DESIGN.
5. RANDOMIZED BLOCK DESIGN.
6. CROSS OVER DESIGN.
22. POST TEST ONLY CONTROL DESIGN
• Is composed of two randomly assigned
group - experimental & control groups.
• Both the groups are not tested previous to
the introduction of an intervention.
• While treatment is implemented on the
experimental group only, post test
observations are made on both the groups.
23. • This design is helpful in situations where
it is not possible to pre teat the
subjects.
• E.g., A study on educational
intervention related to contraception
among couples.
24. POST TEST ONLY CONTROL DESIGN
RANDOM
ASSIGNMENT
EXP GROUP
CONTROL
GRP
TREATMENT POST TEST
POST TEST
25. PRETEST-POST-TEST-ONLY DEIGN
• In this design, subjects are randomly
assigned to either the experimental
or control group.
• The effect of the dependent variable
on both the groups is seen before
the treatment (pre test).
26. • Following this the treatment is
carried out on experimental group
only.
• After treatment observation of
dependent variable is made on both
the groups to examine the effect of
the manipulation of independent
variable on dependent variable.
27. PRETEST –POST TEST ONLY DESIGN
RANDOM
ASSIGNMENT
EXP GROUP
CONTROL
GRP
TREATMENT
POST TEST
POST TEST
PRE
TEST
PRE
TEST
28. SOLOMON FOUR GROUP DESIGN
• There are two experimental and
two control group.(control group - I
& II) (Exp group- I &II).
• Initially the researcher randomly
assigns subjects to the four groups.
29. • Out of four groups, only exp grp I & control
grp I receives the pre test followed by the
treatment to the experimental grp I & II.
• Finally all the four groups receive post test,
where the effects of the dependent
variables of the study are observed and
comparison is made of the four groups to
assess the effect of independent variable
(experimental variable) on the dependent
variable.
30. • The experimental group II is
observed at one occasion.
• To estimate the amount of change in
experimental & control group II the
average test scores of experimental
& control groups I are used as
baseline.
31. • The solomon four group design is
considered to be most prestigious
experimental research design, because it
minimizes the threat to internal and
external validity.
• The test effectively presents the reactive
effects of the pre test.
• Any difference between the experimental
and control group can be more confidently
attributed to the experimental treatment.
32. • The disadvantage of this design is that it
requires a large sample and statistical
analysis, and therefore not commonly
used in health care researches.
33. SOLOMON FOUR GROUP DESIGN
RANDOM
ASSIGNMENT
Exp grp I
Exp grp II
Cont grp I
Cont grp II
Pre test
Pre test
Treatment
Treatment
Post
test
Post
test
Post
test
Post
test
34. FACTORIAL DESIGN
• Here the researcher manipulates
two or more independent variables
simultaneously to observe their
effects on the dependent variables.
• This design is particularly useful
when there are more than two
independent variables to be tested.
35. • E.g., researcher wants to test the
efficacy of two different medication.
• The design facilitates the testing of
several hypotheses at a single time.
• Typically factorial design incorporates
2x2 or 2x3 factorial. (it can be any
combination)
36. • The first number (alpha - A) refers to the
independent variables or the types of
experimental treatments and the
second number (beta -B) refers to the
level or frequency of the treatment.
37. FACTORIAL DESIGN
FREQUENCY OF
TREATMENT
PROTOCOLS OF
TREATMENT
PROTOCOLS OF
TREATMENT
ALPHA (I)
(DRUG I)
BETA (II)
(DRUG II)
4 hourly (B1) A1 B1 A2 B1
6 hourly (B2) A1 B2 A2 B2
8 hourly (B3) A1 B3 A2 B3
38. RANDOMIZED BLOCK DESIGN
• Randomized block design is used when
the researcher desires to bring
homogeneity among selected groups.
• This is a simple method to reduce the
variability among the treatment groups
by a more homogenous combination of
the subjects through randomized block
design.
39. • For example if the researcher wants to test
the efficacy of three different medications
in reducing hypertension, to ensure
homogeneity among subjects under
treatment, researcher randomly places the
subjects in homogenous groups (blocks).
• like patients with hypertension, diabetic
patients with hypertension and
hypertensive patients with heart diseases.
40. The design looks similar to that of
factorial design in structure, but out
of two factors one factor is not
experimentally manipulated.
41. RANDOMIZED BLOCK DESIGN
TYPE OF
HYPERTENSIVE
DRUG
BLOCKS BLOCKS BLOCKS
PATIENT WITH
HYPERTENSION
(I)
DIABETIC
PATIENT WITH
HYPERTENSION
(II)
PATIENT WITH
HEART DISEASE
AND
HYPERTENSION
(III)
A A,1 A, I A, III
B B,1 B, I B, II
C C,1 C, I C, III
42. CROSS OVER DESIGN
• In cross over design the study
subjects are exposed to more than
one treatment.
• It is also known as “repeat measure
design”.
43. • This design is more efficient in establishing
the highest possible similarity among
subjects exposed to different conditions
where groups compared obviously have
equal distribution of characteristics.
• Some times this design is not effective
because, when subjects are exposed to two
different conditions, their responses of the
second condition may be influenced by
their experience in the first condition.
44. CROSS OVER DESIGN
GROUPS TREATMENT
PROTOCOL
TREATMENT
PROTOCOL
GROUP I TREATMENT I TREATMENT II
GROUP II TREATMENT II TREATMENT I
45. ADVANTAGES OF TRUE
EXPERIMENTAL DESIGN
• Most powerful design to establish the
causal relationship between
independent and dependent variable.
• Since the study is conducted under
controlled environment, it can yield a
greater degree of purity in observation.
46. • Conditions that are not found in natural
setting can be created in experimental
setting in a short period of time that may
take years to naturally occur (therefore
very useful in genetic studies).
• Because the experiment is carried out in
experimental setting the problems of
real life situations and the personal
problems of the researcher is eliminated.
47. DISADVANTAGES OF TRUE
EXPERIMENTAL DESIGN
• Most often the results of experimental
designs cannot be replicated in studies
conducted on humans due to ethical
problems.
• Many of the human variables neither
have valid measurable criteria nor
instruments to measure them.
48. • In experimental studies conducted in
natural settings like a hospital or
community, it is not possible to impose
control over extraneous variables.
• Experiments are often more impractical
when the effect of independent variable
may require a lengthy period of time
before it can emerge as a response on
the criterion measures.
49. • It is very difficult to obtain permission from the
participants.
• Because the size of the sample is kept small
especially studies involving humans, the
representativeness of the findings of such study
is questionable.
• Though theoretically experimental designs can
yields a greater insights , yet practically many a
times they are not possible in human studies as
humans & their parameters are complex.